Press



L. PETERS PRESS 2 Sheets-Sheet l Fig. 1

Invenor: Em/HARD WETERS ATTO'RA/EYS April 25, 1967 Filed June v 28, 1965 L. PETERS April 25, 1967 PRESS 2 sheets-sheet 2 Filed June 28, 1965 o 3 m dw WA/$14.1 7 m 2l l 1 0 3 S m m. 0 m C.. u w n o nl l. J s

Inventor: LEON/MWD PETWS ATTOW/VEY United States Patent 3,315,596 PRESS Leonhard Peters, Schwabisch Gmund, Germany, assignor to May-Pressenbau G.m.b.H., Strassdorf, near Schwabisch Gmund, Germany Filed June 28, 1965, Ser. No. 467,618

Claims priority, application Germany, July 21, 1964,

Claims. (Cl. 10D-282) This invention relates to a press of the type having a frame and a plunger moving in a straight line pivotally connected to a lever system. The lever system comprises a short and a long lever which form an acute angle during a stroke of the press.

These known presses are arranged in such a manner that the short lever is xedly mounted on a support, which maybe the base plate of the frame. This iixed point 1s characteristic for a given press, because each change of the iixed point substantially iniiuences the angle between the levers during a stroke of the press. Due to this fact, the designer is rather limited in the arrangement of the remaining machine parts with respect to each other and is unable to change the arrangement as might be required in view of some other requirements.

It is an object of the invention to provide a machine in which the aforementioned shortcomings are eliminated. This is accomplished, according to the present invention, by having a free end of the long lever mounted at a fixed location on the frame and the free end of the short lever mounted on the plunger. This arrangement permits a substantial change in the iixed location, without changing the characteristics of the press. Itis also possible, in contradistinction to known devices, to arrange the levers at the side of the plunger in such a manner that the opening through the press between the support and the plunger remains open. This 'arrangement permits the use of the machine for conveyor type work. Aside from this fact, an opening like this is required in many cases because in this way a continuous supply of material can be fed to the machine which p'ennits an automatization of the machine. It should be noted that a single lever system could actuate the plunger. However, for a better and more effective power transmission at least one lever system is arranged on both sides of the plunger.

The arrangement of the lever system on either side of the plunger permits the system to be symmetrically arranged with respect to a central transverse plane, that is, at a right angle of the plane of the press opening. This results in a very favorable construction. An especially advantageous construction is achieved by arranging a single short lever symmetrically to the central transverse plane, and two long levers, likewise arranged symmetrically with respect to said plane for cooperation with the single short lever, -with which they form a pair of bell crank lever systems. The long levers are pivotally mounted about common center axes, one of which is secured to xed parts of the frame and the other of which passes through a common pivot axis. When the short lever is mounted as aforementioned, the whole system can again be symmetrically mounted with respect to the central transverse plane of the machine whereby a symmetrical drive is attained. This arrangement not only reduces the wear of the machine, but also simplifies and improves the construction thereof.

According to the invention, both of the long levers are connected at one end with each other at the pivot axis by means of a pivotal member which can be a shaft on which the short lever is mounted. The opposite end of the long levers can be secured each by itself on a iixed part to the machine frame, or commonly pivoted by means of a single shaft.

3,3 15,5 96 Patented Apr. 25, 1967 lCe The power transmission to the plunger is further improved in that the single short lever can be substantially wide, due to the two long levers. This arrangement permits to increase the width of theshort bell crank to the width of the plunger. This also enhances the power transmission and improves the mounting of the short lever.

The drive of the machine is mounted in the upper portion of the machine frame, the fixed pivot of the long levers is arranged at the lower portion of the frame, and this would result in a very favorable construction since the base of the machine would require only a minimum of space and a pit for accommodating of any machine parts would be dispensable.

The various features of the novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the specilication. For a better understanding of the invention, its operating advantages and the specific objects attained by its use, reference should be made to the accompanying drawings and descriptive matter in which:

FIG. l shows a press according to the invention in front view with some parts broken away; V

FIG. 2 shows a section along line 2 2 of FIG. 1; and

FIG. 3 shows a section along lines 3 3 of FIG. l.

Referring now to the drawings, FIG. 1 shows a press generally indicated by 1 0 having a lower frame 11 and an upper frame 12. These two frame parts are connected by two side frames 13 and 14, respectively, comprising guides for a vertically movable plunger 20.A A support table 22 is mounted on the upper face of frame 11 opposite the plunger. Between the plunger 20 and the supporting table 22 is a lateral opening 25 which is at a right angle to a central plane d a shown in FIG. 2. Since the left hand and the right hand levers are constructed in thesame way, it is sufiicient only to refer to one of them. In the following the right hand lever pair will be described as shown in FIG. l.

A pair of long levers 30 and 31 are pivotally mounted at one end on a fixed shaft 34 secured to the frame at 35 and 36 (FIG. 2). A spacer 40 is mounted on the shaft 34 between frame parts 38 and 39.

Both long levers 30 and 31 are connected by a shaft 45 forming a pivot and a short lever 50 is mounted on the shaft 45 symmetrically with the plane a`a between the ends 46 and 47 of the shaft 45. The short lever 50 is pivotally connected at its free end 48 to a plunger pin 49. The plunger pin 49 is secured to a pair of arms 51 and 52 which are mounted on a bracket 54 of the plunger 20.

Connecting rods 60 and 61 are pivotally connected at one end to the shaft 45 between the levers 30 and 31, and are pivotally connected with their other ends to crank pins 64 and 65 (FIG. 3). The crank pins 64 and 65 are secured to cranks 66 and 67 which are mounted on a crank shaft 68. Crank shaft 68 is journalled in the frame at 70 and 71, and carries two gears 72 and 73, respectively, which are spaced from each other. All aforementioned parts are symmetrically arranged with respect to the plane :1 -af. The drive of both drive gears 72 and 73 will be described schematically with respect to FIG. 1 since the drive is known and does not form a part of this invention.

Gears 72 and 73 are in engagement each with a reduction gear 75, shown in FIG. 1. This reduction gear is mounted on a shaft (not shown) on which a further gear 76 is mounted. A gear 78 is in engagement with the gear 76. The drive of the left hand levers in FIG. 1 operates in a similar manner with the only modication that a gear 80 is in engagement with left gear 76 of FIG. l, and the gear 80 is in engagement with the gear 78.

From FIG. l, it can be seen that it is now possible to arrange -the stationary shafts 34, respectively, on the frame in a manner that corresponds to the characteristics of the should rather be press without changing the operating angle and withoutinuencing the characteristic of thepress, The lever systems can also be arranged in a very favorable manner,

namely laterally away from the machine opening 25 so Y that the space between the plunger and the table support remains open. The lateral arrangement of the lever systems with respect to the plunger permits the drive mecha- Vnism to be arrangedrin such a manner that Vit is symmeti-ical with the lateral central plane a-a, resultingvin Y l a very favorable design and drive construction.

, This invention should not be limited to the specic embodiments shown by the accompanying drawings but dened by the scope of the appended claims. Y

What I claim is: V1. In a press, a plunger, frame means guiding said plunger for vertical movement, a stationary pivot carried by said frame means at an elevation lower than said plunger, a long lever pivotally carried by said pivot and extending upwardly therefrom to an elevation higher than said plunger, said lever having an upper free` end, a sec- Vond pivot carried by saidA lever at its upper free end,` a`

shortV lever pivotally connected to said plunger and said second pivot, a connecting rod pivotally connected to said second pivot and situated at an upper partof said frame means', and a rotary crank situated at saidupper part of said trame means and operatively connected to said connecting rod for reciprocating the latter to swing Vsaid long lever about said stationary pivot while moving said second pivot along part of a circle whose center is in said stationary pivot, the swinging movement of said second pivot being transmitted through said Yshort'lever to said Yplunger for moving the latter vertically with respect to said framemeans.

2. The combination of claim 1 and Vwherein a .pair of Y tional pivot and to said plunger at a side thereof opposite t means is formed with an opening situatedrbeneath said plunger, said long levers and-said short lever'beingy situated at one side of said opening, and a second stationary pivot as well as a second pair of said long levers being il situated at an opposite side of said opening, said second pair of longtlevers having upper free ends distant from said second stationary pivot, an additional pivot extending t,

between and carried by said upper free ends of said second pair of long levers, a second short lever carried by said additional pivot between said second pair of long levers, said second short lever being pivotally connected with said plunger at a side thereof opposite trom said rst-mentioned short'lever, a second pair of connecting rods connected to said additional pivot, said second short lever situated between said second pair of connectingrods, and asecond rotary. crank 'operatively connected with said second pair of connecting rods for reciprocating the latter.

5. The combination of claim land wherein a second stationary pivot is carried by said frame at the same elevation as said irst stationary pivot, a second .long lever connected to said second stationary pivot and extending up` wardly therefrom, said second long lever having a free end distant hom said second stationary pivot, an Vadditional pivot carried byV said free endof said second long lever, a second short lever pivotally connected to`said addi? from the connection of said plunger to said first-mentioned short lever, a second connecting rod connected to said additional pivot, and a second rotary crank'connected to said long levers are carried by said stationary pivot spaced Y from each other, said short lever being situated on said second pivot between said pair of long levers and having a width substantially equal to that Yof said plunger.

3. The combination of claim 2 and wherein a pair of said connecting rods are respectively connected to said Y rotary crank and situated at opposite sides of said short lever.

4. V,The combination of claim 3 and wherein said frame said second connecting rod for reciprocating the latter.

References Cited bythe Examiner BILLY J. WILHITE, Primary Examiner.

stinebaugh 'I4-40x11 Y 

1. IN A PRESS, A PLUNGER, FRAME MEANS GUIDING SAID PLUNGER FOR VERTICAL MOVEMENT, A STATIONARY PIVOT CARRIED BY SAID FRAME MEANS AT AN ELEVATION LOWER THAN SAID PLUNGER, A LONG LEVER PIVOTALLY CARRIED BY SAID PIVOT AND EXTENDING UPWARDLY THEREFROM TO AN ELEVATION HIGHER THAN SAID PLUNGER, SAID LEVER HAVING AN UPPER FREE END, A SECOND PIVOT CARRIED BY SAID LEVER AT ITS UPPER FREE END, A SHORT LEVER PIVOTALLY CONNECTED TO SAID PLUNGER AND SAID SECOND PIVOT, A CONNECTING ROD PIVOTALLY CONNECTED TO SAID SECOND PIVOT AND SITUATED AT AN UPPER PART OF SAID FRAME MEANS, AND A ROTARY CRANK SITUATED AT SAID UPPER PART OF SAID FRAME MEANS AND OPERATIVELY CONNECTED TO SAID CONNECTING ROD FOR RECIPROCATING THE LATTER TO SWING SAID LONG LEVER ABOUT SAID STATIONARY PIVOT WHILE MOVING SAID SECOND PIVOT ALONG PART OF A CIRCLE WHOSE CENTER IS IN SAID STATIONARY PIVOT, THE SWINGING MOVEMENT OF SAID SECOND PIVOT BEING TRANSMITTED THROUGH SAID SHORT LEVER TO SAID PLUNGER FOR MOVING THE LATTER VERTICALLY WITH RESPECT TO SAID FRAME MEANS. 